INOR 667 |
| Many potassium carboxylate complexes have an unusual coordination geometry. In the solid state the complexes are two-dimensional coordination polymers, with individual potassium ions in a pseudo-five coordinate, square pyramidal environment. One of the repeat distances of the polymer is always 4 Å or 8 Å, depending on whether the carboxylates are translation related by 4 Å and superimposable, or related by 8 Å and having alternating orientations of the carboxylate. If these materials contain unsaturation, short contacts < 4 Å occur, leading to polymeric materials upon 60Co γ-irradiation. Examples include polymorphism of potassium propionate, including two polymorphs with 4 and 8 Å repeat distances, and potassium methacrylate, a 4 Å phase first shown by Morawetz to undergo solid-state polymerization. The structure of potassium methacrylate has remained a puzzle since 1962. |
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Characterization and Applications of Coordination Compounds
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Sci-Mix
Division of Inorganic Chemistry |